Use dialog fragment to delete error operations

app/src/main/java/eu/faircode/email/FragmentOperations.java

@@ -19,6 +19,7 @@ package eu.faircode.email;
     Copyright 2018-2019 by Marcel Bokhorst (M66B)
 */
 
+import android.app.Dialog;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
@@ -35,7 +36,9 @@ import android.widget.TextView;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.appcompat.app.AlertDialog;
 import androidx.constraintlayout.widget.Group;
+import androidx.fragment.app.DialogFragment;
 import androidx.lifecycle.Observer;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
@@ -122,7 +125,7 @@ public class FragmentOperations extends FragmentBase {
                 onMenuHelp();
                 return true;
             case R.id.menu_delete:
-                onMenuDelete();
+                new DialogDelete().show(getFragmentManager(), "operations:delete");
                 return true;
 
             default:
@@ -134,8 +137,17 @@ public class FragmentOperations extends FragmentBase {
         startActivity(getFAQIntent());
     }
 
-    private void onMenuDelete() {
+    private Intent getFAQIntent() {
-        new DialogBuilderLifecycle(getContext(), getViewLifecycleOwner())
+        Intent intent = new Intent(Intent.ACTION_VIEW);
+        intent.setData(Uri.parse(Helper.FAQ_URI + "#user-content-faq3"));
+        return intent;
+    }
+
+    public static class DialogDelete extends DialogFragment {
+        @NonNull
+        @Override
+        public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
+            return new AlertDialog.Builder(getContext())
                     .setMessage(R.string.title_delete_operation)
                     .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                         @Override
@@ -159,16 +171,11 @@ public class FragmentOperations extends FragmentBase {
                                 protected void onException(Bundle args, Throwable ex) {
                                     Helper.unexpectedError(getContext(), getViewLifecycleOwner(), ex);
                                 }
-                        }.execute(FragmentOperations.this, new Bundle(), "operation:delete");
+                            }.execute(getContext(), getActivity(), new Bundle(), "operations:delete");
                         }
                     })
                     .setNegativeButton(android.R.string.cancel, null)
-                .show();
+                    .create();
         }
-
-    private Intent getFAQIntent() {
-        Intent intent = new Intent(Intent.ACTION_VIEW);
-        intent.setData(Uri.parse(Helper.FAQ_URI + "#user-content-faq3"));
-        return intent;
     }
 }